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9925723 R01 - 2015 RZR 900 Service Manual
© Copyright 2014 Polaris Industries Inc.
Piston Ring to Groove Clearance Inspection
1. Measure piston ring to groove clearance
by
placing the ring in the ring land and measuring with a
thickness (feeler) gauge. Replace piston and rings if
ring-to-groove clearance exceeds service limits.
Piston Ring to Groove Clearance:
Top Ring: 0.0012 - 0.0037" (.030 - .095 mm)
Second Ring: 0.0012 - 0.0030" (.030 - .076 mm)
Service Limit: .0047" (.12 mm)
Piston Ring Installed Gap
1. Place each piston ring
. Use
the piston to push the ring squarely into cylinder, as
shown below.
2. Measure installed gap with a feeler gauge
at both
the top and bottom of the cylinder.
NOTE: A difference between top and bottom end
gap measurements is a general indication of
cylinder taper (wear). The cylinder should be
measured for taper and out of round.
3. If the installed gap measurement exceeds the
service limit, replace the rings.
Piston Ring Installed Gap:
Top Ring: .008 - .014" (.20 - .36 mm)
Service Limit: .020" (.50 mm)
Second Ring: .015 - .025" (.37 - .63 mm)
Service Limit: .028" (.70 mm)
Oil Control Rails: .010 - .040" (.25 - 1.02 mm)
Service Limit: .059" (1.50 mm)
NOTE: Always check piston ring installed gap
when installing new rings and/or a new cylinder.
ENGINE / COOLING SYSTEM
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